There is a way to protect the element on an O2 sensor. When you make the bung, create a small hood to protect the element. Something like the bill of a ball cap. The hood is positioned on the upstream side of the exhaust flow. Make it about 40% of a circle and just long enough to cover the element. The sensor will read the exhaust flow just file and the combustion residue will not collect on the element. The O2 sensor will last many times longer with this small mod. Someone discovered this when running 60lbs. boost with 110 octane race gas.
Interestingly, Chrysler cast this little shield in the exhaust manifolds of the later model I4 8V motors. Wayne DeLisle Sr. oldmoparguy at carolina dot rr dot com -- > KR> Cyberdyne mixture meter > > Mark Langford ml at n56ml.com > Sun Jul 31 14:56:35 EDT 2016 > > Wide band units and there sensors are very expensive, as was mentioned, > and simply not needed for our application. I have almost 1400 hours > flying behind one that looks just like this (apparently a Cyberdyne > knockoff, or perhaps just "rebranded"), and I can't imagine what other > information I would need from an air/fuel meter. Bosch part number is > 11027. More on this is at http://www.n56ml.com/corvair/o2meter/ . > 100LL eats these things every hundred hours or so, so that's another > reason to go cheap... > > Mark Langford > ML at N56ML.com > http://www.n56ml.com
